(between 300 ms and 600 ms) (Gehring and Willoughby, 2002; Yeung and Sanfey, 2004; Hajcak et al., 2005; Yeung et al., 2005; Hajcak et al., 2006; Holroyd et al., 2006; Cohen and Ranganath, 2007; Kamarajan et al., 2009). In our previous ERP study of reward processing using a MGT in alcoholics, we found that alcoholics showed significantly lower amplitudes of N2/ORN and P3/ORP components and decreased current density in cingulate gyrus, along with higher levels of impulsivity and risk-taking features than controls (Kamarajan et al., 2010). While FRN/N2 is another important component of feedback processing, the current study focuses solely on the P3 component for the following reasons: 1) dealing with both components (P3 and N2) in a single study with multiple factors (risk group, gender, age group) may render the study too complex; 2) with regard to alcoholism and risk, P3 is considered to be the most robust ERP component and a sensitive biomarker, and therefore the analysis of P3 has assumed its precedence in the current study; 3) FRN/N2 is a relatively subtle component and more prone to artifact distortions, rendering it more difficult to measure (especially in such a large sample of adolescents and young adults) compared
